An oil rich region of Sudan is seen by some as the tinderbox for Africa's next war.
Abyei is sandwiched between North and South.
But a referendum in three years time will decide whether to merge with southern Sudan.
Tension is already brewing over grazing rights between the African Dinka and the Misseriya Arabs who move south every winter.
The Dinka believe the Arabs are only guests on their territory and should recognise their right to the land.
Mohamed Vall found a tribe fearing for their way of life.
Interview with Newton Kanhema of the Zimbabwe Independence Assistance Network talks about Zimbabwe's Prime Minister Morgan Tsvangirai's U.S. visit.